1 /*
2 * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 /* Runtime firmware routines to report errata status for the current CPU. */
8
9 #include <arch_helpers.h>
10 #include <assert.h>
11 #include <cpu_data.h>
12 #include <debug.h>
13 #include <errata_report.h>
14 #include <spinlock.h>
15 #include <utils.h>
16
17 #ifdef IMAGE_BL1
18 # define BL_STRING "BL1"
19 #elif defined(AARCH64) && defined(IMAGE_BL31)
20 # define BL_STRING "BL31"
21 #elif defined(AARCH32) && defined(IMAGE_BL32)
22 # define BL_STRING "BL32"
23 #else
24 # error This image should not be printing errata status
25 #endif
26
27 /* Errata format: BL stage, CPU, errata ID, message */
28 #define ERRATA_FORMAT "%s: %s: errata workaround for %s was %s\n"
29
30 /*
31 * Returns whether errata needs to be reported. Passed arguments are private to
32 * a CPU type.
33 */
errata_needs_reporting(spinlock_t * lock,uint32_t * reported)34 int errata_needs_reporting(spinlock_t *lock, uint32_t *reported)
35 {
36 int report_now;
37
38 /* If already reported, return false. */
39 if (*reported)
40 return 0;
41
42 /*
43 * Acquire lock. Determine whether status needs reporting, and then mark
44 * report status to true.
45 */
46 spin_lock(lock);
47 report_now = !(*reported);
48 if (report_now)
49 *reported = 1;
50 spin_unlock(lock);
51
52 return report_now;
53 }
54
55 /*
56 * Print errata status message.
57 *
58 * Unknown: WARN
59 * Missing: WARN
60 * Applied: INFO
61 * Not applied: VERBOSE
62 */
errata_print_msg(unsigned int status,const char * cpu,const char * id)63 void errata_print_msg(unsigned int status, const char *cpu, const char *id)
64 {
65 /* Errata status strings */
66 static const char *const errata_status_str[] = {
67 [ERRATA_NOT_APPLIES] = "not applied",
68 [ERRATA_APPLIES] = "applied",
69 [ERRATA_MISSING] = "missing!"
70 };
71 static const char *const __unused bl_str = BL_STRING;
72 const char *msg __unused;
73
74
75 assert(status < ARRAY_SIZE(errata_status_str));
76 assert(cpu);
77 assert(id);
78
79 msg = errata_status_str[status];
80
81 switch (status) {
82 case ERRATA_NOT_APPLIES:
83 VERBOSE(ERRATA_FORMAT, bl_str, cpu, id, msg);
84 break;
85
86 case ERRATA_APPLIES:
87 INFO(ERRATA_FORMAT, bl_str, cpu, id, msg);
88 break;
89
90 case ERRATA_MISSING:
91 WARN(ERRATA_FORMAT, bl_str, cpu, id, msg);
92 break;
93
94 default:
95 WARN(ERRATA_FORMAT, bl_str, cpu, id, "unknown");
96 break;
97 }
98 }
99